Mouthpiece plug for electronic cigarette



FIG. 1 is a side elevation view of a mouthpiece plug for electronic cigarette showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a perspective view thereof; and,

FIG. 5 is a perspective view thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM I claim the ornamental design for a mouthpiece plug for electronic cigarette, as shown and described. 